Power Macintosh 8600, 9600: Processor Card Compatibility

I upgraded my Power Macintosh 8600/9600/9650 processor card (original speed of 250 MHz or faster) with a better card. Can I install the leftover PowerPC 604e procesor card into a slower Power Macintosh (original speed of LESS than 250 Mhz)?
No. There were changes to the logic board of the computers listed below to support the inline cache design of the processor card that came with the computers. Their processor cards are not compatible with any computer not listed below.

For example: a 9600/350's processor card would not work on a 8600/200, but it would work in a 8600/250.

Computers that use the inline cache include the following:

Published Date: Feb 18, 2012